Check if labels field exists in customDiff function

.changelog/9043.txt

@@ -0,0 +1,3 @@
+```release-note:bug
+provider: fixed the bug that labels/annotations field not exists in GA for some resources
+```

google-beta/tpgresource/annotations.go

@@ -10,6 +10,11 @@ import (
 )
 
 func SetAnnotationsDiff(_ context.Context, d *schema.ResourceDiff, meta interface{}) error {
+	raw := d.Get("annotations")
+	if raw == nil {
+		return nil
+	}
+
 	o, n := d.GetChange("annotations")
 	effectiveAnnotations := d.Get("effective_annotations").(map[string]interface{})
 
@@ -36,6 +41,11 @@ func SetMetadataAnnotationsDiff(_ context.Context, d *schema.ResourceDiff, meta
 		return nil
 	}
 
+	raw := d.Get("metadata.0.annotations")
+	if raw == nil {
+		return nil
+	}
+
 	o, n := d.GetChange("metadata.0.annotations")
 	effectiveAnnotations := d.Get("metadata.0.effective_annotations").(map[string]interface{})
 

google-beta/tpgresource/labels.go

@@ -38,7 +38,12 @@ func SetLabelsDiff(_ context.Context, d *schema.ResourceDiff, meta interface{})
 		terraformLabels[k] = v
 	}
 
-	labels := d.Get("labels").(map[string]interface{})
+	raw := d.Get("labels")
+	if raw == nil {
+		return nil
+	}
+
+	labels := raw.(map[string]interface{})
 	for k, v := range labels {
 		terraformLabels[k] = v.(string)
 	}
@@ -73,6 +78,11 @@ func SetMetadataLabelsDiff(_ context.Context, d *schema.ResourceDiff, meta inter
 		return nil
 	}
 
+	raw := d.Get("metadata.0.labels")
+	if raw == nil {
+		return nil
+	}
+
 	config := meta.(*transport_tpg.Config)
 
 	// Merge provider default labels with the user defined labels in the resource to get terraform managed labels
@@ -81,7 +91,7 @@ func SetMetadataLabelsDiff(_ context.Context, d *schema.ResourceDiff, meta inter
 		terraformLabels[k] = v
 	}
 
-	labels := d.Get("metadata.0.labels").(map[string]interface{})
+	labels := raw.(map[string]interface{})
 	for k, v := range labels {
 		terraformLabels[k] = v.(string)
 	}